diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..1d4b09d
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,2 @@
+*/target
+*/.vscode
diff --git a/1-report_repair/.vscode/tasks.json b/1-report_repair/.vscode/tasks.json
deleted file mode 100644
index ffef723..0000000
--- a/1-report_repair/.vscode/tasks.json
+++ /dev/null
@@ -1,13 +0,0 @@
-{
-	"version": "2.0.0",
-	"tasks": [
-		{
-			"type": "cargo",
-			"command": "run",
-			"problemMatcher": [
-				"$rustc"
-			],
-			"label": "rust: cargo run"
-		}
-	]
-}
\ No newline at end of file
diff --git a/10-adapter_array/target/.rustc_info.json b/10-adapter_array/target/.rustc_info.json
deleted file mode 100644
index b119a67..0000000
--- a/10-adapter_array/target/.rustc_info.json
+++ /dev/null
@@ -1 +0,0 @@
-{"rustc_fingerprint":4191169781050156317,"outputs":{"13789308117277828956":["___\nlib___.rlib\nlib___.so\nlib___.so\nlib___.a\nlib___.so\n/home/arvil/.rustup/toolchains/stable-x86_64-unknown-linux-gnu\ndebug_assertions\nfeature=\"cargo-clippy\"\nproc_macro\ntarget_arch=\"x86_64\"\ntarget_endian=\"little\"\ntarget_env=\"gnu\"\ntarget_family=\"unix\"\ntarget_feature=\"fxsr\"\ntarget_feature=\"sse\"\ntarget_feature=\"sse2\"\ntarget_os=\"linux\"\ntarget_pointer_width=\"64\"\ntarget_vendor=\"unknown\"\nunix\n",""],"4476964694761187371":["___\nlib___.rlib\nlib___.so\nlib___.so\nlib___.a\nlib___.so\n/home/arvil/.rustup/toolchains/stable-x86_64-unknown-linux-gnu\ndebug_assertions\nproc_macro\ntarget_arch=\"x86_64\"\ntarget_endian=\"little\"\ntarget_env=\"gnu\"\ntarget_family=\"unix\"\ntarget_feature=\"fxsr\"\ntarget_feature=\"sse\"\ntarget_feature=\"sse2\"\ntarget_os=\"linux\"\ntarget_pointer_width=\"64\"\ntarget_vendor=\"unknown\"\nunix\n",""],"1164083562126845933":["rustc 1.46.0 (04488afe3 2020-08-24)\nbinary: rustc\ncommit-hash: 04488afe34512aa4c33566eb16d8c912a3ae04f9\ncommit-date: 2020-08-24\nhost: x86_64-unknown-linux-gnu\nrelease: 1.46.0\nLLVM version: 10.0\n",""],"16929990295604814582":["___\n",""],"2196823701345282402":["___\nlib___.rlib\nlib___.so\nlib___.so\nlib___.a\nlib___.so\n/home/arvil/.rustup/toolchains/stable-x86_64-unknown-linux-gnu\ndebug_assertions\nproc_macro\ntarget_arch=\"x86_64\"\ntarget_endian=\"little\"\ntarget_env=\"gnu\"\ntarget_family=\"unix\"\ntarget_feature=\"fxsr\"\ntarget_feature=\"sse\"\ntarget_feature=\"sse2\"\ntarget_os=\"linux\"\ntarget_pointer_width=\"64\"\ntarget_vendor=\"unknown\"\nunix\n",""],"9859703030026944830":["___\n",""]},"successes":{}}
\ No newline at end of file
diff --git a/10-adapter_array/target/CACHEDIR.TAG b/10-adapter_array/target/CACHEDIR.TAG
deleted file mode 100644
index ec615bc..0000000
--- a/10-adapter_array/target/CACHEDIR.TAG
+++ /dev/null
@@ -1,3 +0,0 @@
-Signature: 8a477f597d28d172789f06886806bc55
-# This file is a cache directory tag created by cargo.
-# For information about cache directory tags see https://bford.info/cachedir/
\ No newline at end of file
diff --git a/10-adapter_array/target/debug/.cargo-lock b/10-adapter_array/target/debug/.cargo-lock
deleted file mode 100644
index e69de29..0000000
diff --git a/10-adapter_array/target/debug/.fingerprint/adapter_array-2420e82e6f99395b/bin-adapter_array b/10-adapter_array/target/debug/.fingerprint/adapter_array-2420e82e6f99395b/bin-adapter_array
deleted file mode 100644
index d2fed65..0000000
--- a/10-adapter_array/target/debug/.fingerprint/adapter_array-2420e82e6f99395b/bin-adapter_array
+++ /dev/null
@@ -1 +0,0 @@
-9f0077979e3bf484
\ No newline at end of file
diff --git a/10-adapter_array/target/debug/.fingerprint/adapter_array-2420e82e6f99395b/bin-adapter_array.json b/10-adapter_array/target/debug/.fingerprint/adapter_array-2420e82e6f99395b/bin-adapter_array.json
deleted file mode 100644
index abeb60e..0000000
--- a/10-adapter_array/target/debug/.fingerprint/adapter_array-2420e82e6f99395b/bin-adapter_array.json
+++ /dev/null
@@ -1 +0,0 @@
-{"rustc":7210524046684111384,"features":"[]","target":1974148002437621829,"profile":1613559695681135254,"path":1036222786711178230,"deps":[],"local":[{"CheckDepInfo":{"dep_info":"debug/.fingerprint/adapter_array-2420e82e6f99395b/dep-bin-adapter_array"}}],"rustflags":[],"metadata":14252281678896127600,"config":0}
\ No newline at end of file
diff --git a/10-adapter_array/target/debug/.fingerprint/adapter_array-2420e82e6f99395b/dep-bin-adapter_array b/10-adapter_array/target/debug/.fingerprint/adapter_array-2420e82e6f99395b/dep-bin-adapter_array
deleted file mode 100644
index e2ab2d2..0000000
Binary files a/10-adapter_array/target/debug/.fingerprint/adapter_array-2420e82e6f99395b/dep-bin-adapter_array and /dev/null differ
diff --git a/10-adapter_array/target/debug/.fingerprint/adapter_array-2420e82e6f99395b/invoked.timestamp b/10-adapter_array/target/debug/.fingerprint/adapter_array-2420e82e6f99395b/invoked.timestamp
deleted file mode 100644
index e00328d..0000000
--- a/10-adapter_array/target/debug/.fingerprint/adapter_array-2420e82e6f99395b/invoked.timestamp
+++ /dev/null
@@ -1 +0,0 @@
-This file has an mtime of when this was started.
\ No newline at end of file
diff --git a/10-adapter_array/target/debug/.fingerprint/adapter_array-2cecd1a04665a8d4/bin-adapter_array b/10-adapter_array/target/debug/.fingerprint/adapter_array-2cecd1a04665a8d4/bin-adapter_array
deleted file mode 100644
index b773c0a..0000000
--- a/10-adapter_array/target/debug/.fingerprint/adapter_array-2cecd1a04665a8d4/bin-adapter_array
+++ /dev/null
@@ -1 +0,0 @@
-ea7345836e0e7445
\ No newline at end of file
diff --git a/10-adapter_array/target/debug/.fingerprint/adapter_array-2cecd1a04665a8d4/bin-adapter_array.json b/10-adapter_array/target/debug/.fingerprint/adapter_array-2cecd1a04665a8d4/bin-adapter_array.json
deleted file mode 100644
index 6106235..0000000
--- a/10-adapter_array/target/debug/.fingerprint/adapter_array-2cecd1a04665a8d4/bin-adapter_array.json
+++ /dev/null
@@ -1 +0,0 @@
-{"rustc":7210524046684111384,"features":"[]","target":1974148002437621829,"profile":18074012566298724745,"path":1036222786711178230,"deps":[],"local":[{"CheckDepInfo":{"dep_info":"debug/.fingerprint/adapter_array-2cecd1a04665a8d4/dep-bin-adapter_array"}}],"rustflags":[],"metadata":14252281678896127600,"config":0}
\ No newline at end of file
diff --git a/10-adapter_array/target/debug/.fingerprint/adapter_array-2cecd1a04665a8d4/dep-bin-adapter_array b/10-adapter_array/target/debug/.fingerprint/adapter_array-2cecd1a04665a8d4/dep-bin-adapter_array
deleted file mode 100644
index e2ab2d2..0000000
Binary files a/10-adapter_array/target/debug/.fingerprint/adapter_array-2cecd1a04665a8d4/dep-bin-adapter_array and /dev/null differ
diff --git a/10-adapter_array/target/debug/.fingerprint/adapter_array-2cecd1a04665a8d4/invoked.timestamp b/10-adapter_array/target/debug/.fingerprint/adapter_array-2cecd1a04665a8d4/invoked.timestamp
deleted file mode 100644
index e00328d..0000000
--- a/10-adapter_array/target/debug/.fingerprint/adapter_array-2cecd1a04665a8d4/invoked.timestamp
+++ /dev/null
@@ -1 +0,0 @@
-This file has an mtime of when this was started.
\ No newline at end of file
diff --git a/10-adapter_array/target/debug/.fingerprint/adapter_array-6533e9e7a9619d0a/dep-test-bin-adapter_array b/10-adapter_array/target/debug/.fingerprint/adapter_array-6533e9e7a9619d0a/dep-test-bin-adapter_array
deleted file mode 100644
index e2ab2d2..0000000
Binary files a/10-adapter_array/target/debug/.fingerprint/adapter_array-6533e9e7a9619d0a/dep-test-bin-adapter_array and /dev/null differ
diff --git a/10-adapter_array/target/debug/.fingerprint/adapter_array-6533e9e7a9619d0a/invoked.timestamp b/10-adapter_array/target/debug/.fingerprint/adapter_array-6533e9e7a9619d0a/invoked.timestamp
deleted file mode 100644
index e00328d..0000000
--- a/10-adapter_array/target/debug/.fingerprint/adapter_array-6533e9e7a9619d0a/invoked.timestamp
+++ /dev/null
@@ -1 +0,0 @@
-This file has an mtime of when this was started.
\ No newline at end of file
diff --git a/10-adapter_array/target/debug/.fingerprint/adapter_array-6533e9e7a9619d0a/output-test-bin-adapter_array b/10-adapter_array/target/debug/.fingerprint/adapter_array-6533e9e7a9619d0a/output-test-bin-adapter_array
deleted file mode 100644
index 21ad1c6..0000000
--- a/10-adapter_array/target/debug/.fingerprint/adapter_array-6533e9e7a9619d0a/output-test-bin-adapter_array
+++ /dev/null
@@ -1,2 +0,0 @@
-{"message":"function is never used: `solve_part2`","code":{"code":"dead_code","explanation":null},"level":"warning","spans":[{"file_name":"src/main.rs","byte_start":716,"byte_end":727,"line_start":23,"line_end":23,"column_start":4,"column_end":15,"is_primary":true,"text":[{"text":"fn solve_part2(folts: &[usize]) -> usize {","highlight_start":4,"highlight_end":15}],"label":null,"suggested_replacement":null,"suggestion_applicability":null,"expansion":null}],"children":[{"message":"`#[warn(dead_code)]` on by default","code":null,"level":"note","spans":[],"children":[],"rendered":null}],"rendered":"\u001b[0m\u001b[1m\u001b[33mwarning\u001b[0m\u001b[0m\u001b[1m: function is never used: `solve_part2`\u001b[0m\n\u001b[0m  \u001b[0m\u001b[0m\u001b[1m\u001b[38;5;12m--> \u001b[0m\u001b[0msrc/main.rs:23:4\u001b[0m\n\u001b[0m   \u001b[0m\u001b[0m\u001b[1m\u001b[38;5;12m|\u001b[0m\n\u001b[0m\u001b[1m\u001b[38;5;12m23\u001b[0m\u001b[0m \u001b[0m\u001b[0m\u001b[1m\u001b[38;5;12m| \u001b[0m\u001b[0mfn solve_part2(folts: &[usize]) -> usize {\u001b[0m\n\u001b[0m   \u001b[0m\u001b[0m\u001b[1m\u001b[38;5;12m| \u001b[0m\u001b[0m   \u001b[0m\u001b[0m\u001b[1m\u001b[33m^^^^^^^^^^^\u001b[0m\n\u001b[0m   \u001b[0m\u001b[0m\u001b[1m\u001b[38;5;12m|\u001b[0m\n\u001b[0m   \u001b[0m\u001b[0m\u001b[1m\u001b[38;5;12m= \u001b[0m\u001b[0m\u001b[1mnote\u001b[0m\u001b[0m: `#[warn(dead_code)]` on by default\u001b[0m\n\n"}
-{"message":"1 warning emitted","code":null,"level":"warning","spans":[],"children":[],"rendered":"\u001b[0m\u001b[1m\u001b[33mwarning\u001b[0m\u001b[0m\u001b[1m: 1 warning emitted\u001b[0m\n\n"}
diff --git a/10-adapter_array/target/debug/.fingerprint/adapter_array-6533e9e7a9619d0a/test-bin-adapter_array b/10-adapter_array/target/debug/.fingerprint/adapter_array-6533e9e7a9619d0a/test-bin-adapter_array
deleted file mode 100644
index da09fb7..0000000
--- a/10-adapter_array/target/debug/.fingerprint/adapter_array-6533e9e7a9619d0a/test-bin-adapter_array
+++ /dev/null
@@ -1 +0,0 @@
-1f74730b1c949727
\ No newline at end of file
diff --git a/10-adapter_array/target/debug/.fingerprint/adapter_array-6533e9e7a9619d0a/test-bin-adapter_array.json b/10-adapter_array/target/debug/.fingerprint/adapter_array-6533e9e7a9619d0a/test-bin-adapter_array.json
deleted file mode 100644
index 7d6b008..0000000
--- a/10-adapter_array/target/debug/.fingerprint/adapter_array-6533e9e7a9619d0a/test-bin-adapter_array.json
+++ /dev/null
@@ -1 +0,0 @@
-{"rustc":7210524046684111384,"features":"[]","target":1974148002437621829,"profile":10655494245791646288,"path":1036222786711178230,"deps":[],"local":[{"CheckDepInfo":{"dep_info":"debug/.fingerprint/adapter_array-6533e9e7a9619d0a/dep-test-bin-adapter_array"}}],"rustflags":[],"metadata":14252281678896127600,"config":0}
\ No newline at end of file
diff --git a/10-adapter_array/target/debug/.fingerprint/adapter_array-e65c4783fd998dbd/dep-test-bin-adapter_array b/10-adapter_array/target/debug/.fingerprint/adapter_array-e65c4783fd998dbd/dep-test-bin-adapter_array
deleted file mode 100644
index e2ab2d2..0000000
Binary files a/10-adapter_array/target/debug/.fingerprint/adapter_array-e65c4783fd998dbd/dep-test-bin-adapter_array and /dev/null differ
diff --git a/10-adapter_array/target/debug/.fingerprint/adapter_array-e65c4783fd998dbd/invoked.timestamp b/10-adapter_array/target/debug/.fingerprint/adapter_array-e65c4783fd998dbd/invoked.timestamp
deleted file mode 100644
index e00328d..0000000
--- a/10-adapter_array/target/debug/.fingerprint/adapter_array-e65c4783fd998dbd/invoked.timestamp
+++ /dev/null
@@ -1 +0,0 @@
-This file has an mtime of when this was started.
\ No newline at end of file
diff --git a/10-adapter_array/target/debug/.fingerprint/adapter_array-e65c4783fd998dbd/test-bin-adapter_array b/10-adapter_array/target/debug/.fingerprint/adapter_array-e65c4783fd998dbd/test-bin-adapter_array
deleted file mode 100644
index 8091741..0000000
--- a/10-adapter_array/target/debug/.fingerprint/adapter_array-e65c4783fd998dbd/test-bin-adapter_array
+++ /dev/null
@@ -1 +0,0 @@
-56ffdf1b4170cfca
\ No newline at end of file
diff --git a/10-adapter_array/target/debug/.fingerprint/adapter_array-e65c4783fd998dbd/test-bin-adapter_array.json b/10-adapter_array/target/debug/.fingerprint/adapter_array-e65c4783fd998dbd/test-bin-adapter_array.json
deleted file mode 100644
index 0ce6c2e..0000000
--- a/10-adapter_array/target/debug/.fingerprint/adapter_array-e65c4783fd998dbd/test-bin-adapter_array.json
+++ /dev/null
@@ -1 +0,0 @@
-{"rustc":7210524046684111384,"features":"[]","target":1974148002437621829,"profile":8341259748240011191,"path":1036222786711178230,"deps":[],"local":[{"CheckDepInfo":{"dep_info":"debug/.fingerprint/adapter_array-e65c4783fd998dbd/dep-test-bin-adapter_array"}}],"rustflags":[],"metadata":14252281678896127600,"config":0}
\ No newline at end of file
diff --git a/10-adapter_array/target/debug/adapter_array b/10-adapter_array/target/debug/adapter_array
deleted file mode 100755
index 16b3f04..0000000
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diff --git a/10-adapter_array/target/debug/adapter_array.d b/10-adapter_array/target/debug/adapter_array.d
deleted file mode 100644
index d54f4ad..0000000
--- a/10-adapter_array/target/debug/adapter_array.d
+++ /dev/null
@@ -1 +0,0 @@
-/home/arvil/code/aoc20/10-adapter_array/target/debug/adapter_array: /home/arvil/code/aoc20/10-adapter_array/data/input /home/arvil/code/aoc20/10-adapter_array/src/main.rs
diff --git a/10-adapter_array/target/debug/deps/adapter_array-2420e82e6f99395b.d b/10-adapter_array/target/debug/deps/adapter_array-2420e82e6f99395b.d
deleted file mode 100644
index 0a8f415..0000000
--- a/10-adapter_array/target/debug/deps/adapter_array-2420e82e6f99395b.d
+++ /dev/null
@@ -1,6 +0,0 @@
-/home/arvil/code/aoc20/10-adapter_array/target/debug/deps/adapter_array-2420e82e6f99395b.rmeta: src/main.rs src/../data/input
-
-/home/arvil/code/aoc20/10-adapter_array/target/debug/deps/adapter_array-2420e82e6f99395b.d: src/main.rs src/../data/input
-
-src/main.rs:
-src/../data/input:
diff --git a/10-adapter_array/target/debug/deps/adapter_array-2cecd1a04665a8d4 b/10-adapter_array/target/debug/deps/adapter_array-2cecd1a04665a8d4
deleted file mode 100755
index 16b3f04..0000000
Binary files a/10-adapter_array/target/debug/deps/adapter_array-2cecd1a04665a8d4 and /dev/null differ
diff --git a/10-adapter_array/target/debug/deps/adapter_array-2cecd1a04665a8d4.d b/10-adapter_array/target/debug/deps/adapter_array-2cecd1a04665a8d4.d
deleted file mode 100644
index b24860c..0000000
--- a/10-adapter_array/target/debug/deps/adapter_array-2cecd1a04665a8d4.d
+++ /dev/null
@@ -1,6 +0,0 @@
-/home/arvil/code/aoc20/10-adapter_array/target/debug/deps/adapter_array-2cecd1a04665a8d4: src/main.rs src/../data/input
-
-/home/arvil/code/aoc20/10-adapter_array/target/debug/deps/adapter_array-2cecd1a04665a8d4.d: src/main.rs src/../data/input
-
-src/main.rs:
-src/../data/input:
diff --git a/10-adapter_array/target/debug/deps/adapter_array-6533e9e7a9619d0a b/10-adapter_array/target/debug/deps/adapter_array-6533e9e7a9619d0a
deleted file mode 100755
index 1157954..0000000
Binary files a/10-adapter_array/target/debug/deps/adapter_array-6533e9e7a9619d0a and /dev/null differ
diff --git a/10-adapter_array/target/debug/deps/adapter_array-6533e9e7a9619d0a.d b/10-adapter_array/target/debug/deps/adapter_array-6533e9e7a9619d0a.d
deleted file mode 100644
index d87daf9..0000000
--- a/10-adapter_array/target/debug/deps/adapter_array-6533e9e7a9619d0a.d
+++ /dev/null
@@ -1,6 +0,0 @@
-/home/arvil/code/aoc20/10-adapter_array/target/debug/deps/adapter_array-6533e9e7a9619d0a: src/main.rs src/../data/input
-
-/home/arvil/code/aoc20/10-adapter_array/target/debug/deps/adapter_array-6533e9e7a9619d0a.d: src/main.rs src/../data/input
-
-src/main.rs:
-src/../data/input:
diff --git a/10-adapter_array/target/debug/deps/adapter_array-e65c4783fd998dbd.d b/10-adapter_array/target/debug/deps/adapter_array-e65c4783fd998dbd.d
deleted file mode 100644
index 4d9e43b..0000000
--- a/10-adapter_array/target/debug/deps/adapter_array-e65c4783fd998dbd.d
+++ /dev/null
@@ -1,6 +0,0 @@
-/home/arvil/code/aoc20/10-adapter_array/target/debug/deps/adapter_array-e65c4783fd998dbd.rmeta: src/main.rs src/../data/input
-
-/home/arvil/code/aoc20/10-adapter_array/target/debug/deps/adapter_array-e65c4783fd998dbd.d: src/main.rs src/../data/input
-
-src/main.rs:
-src/../data/input:
diff --git a/10-adapter_array/target/debug/deps/libadapter_array-2420e82e6f99395b.rmeta b/10-adapter_array/target/debug/deps/libadapter_array-2420e82e6f99395b.rmeta
deleted file mode 100644
index e69de29..0000000
diff --git a/10-adapter_array/target/debug/deps/libadapter_array-e65c4783fd998dbd.rmeta b/10-adapter_array/target/debug/deps/libadapter_array-e65c4783fd998dbd.rmeta
deleted file mode 100644
index e69de29..0000000
diff --git a/10-adapter_array/target/debug/incremental/adapter_array-2kwm2yydblgdj/s-fv8zbje0pr-1ji7jrt-3gqst8fqxc47e/dep-graph.bin b/10-adapter_array/target/debug/incremental/adapter_array-2kwm2yydblgdj/s-fv8zbje0pr-1ji7jrt-3gqst8fqxc47e/dep-graph.bin
deleted file mode 100644
index 3230821..0000000
Binary files a/10-adapter_array/target/debug/incremental/adapter_array-2kwm2yydblgdj/s-fv8zbje0pr-1ji7jrt-3gqst8fqxc47e/dep-graph.bin and /dev/null differ
diff --git a/10-adapter_array/target/debug/incremental/adapter_array-2kwm2yydblgdj/s-fv8zbje0pr-1ji7jrt-3gqst8fqxc47e/query-cache.bin b/10-adapter_array/target/debug/incremental/adapter_array-2kwm2yydblgdj/s-fv8zbje0pr-1ji7jrt-3gqst8fqxc47e/query-cache.bin
deleted file mode 100644
index 2515ce4..0000000
Binary files a/10-adapter_array/target/debug/incremental/adapter_array-2kwm2yydblgdj/s-fv8zbje0pr-1ji7jrt-3gqst8fqxc47e/query-cache.bin and /dev/null differ
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diff --git a/10-adapter_array/target/debug/incremental/adapter_array-2kwm2yydblgdj/s-fv8zbje0pr-1ji7jrt.lock b/10-adapter_array/target/debug/incremental/adapter_array-2kwm2yydblgdj/s-fv8zbje0pr-1ji7jrt.lock
deleted file mode 100755
index e69de29..0000000
diff --git a/10-adapter_array/target/debug/incremental/adapter_array-3bef38bs2b5lg/s-fv8zbji8w1-1jok6d6-1rdkh5b02u9qg/10ey4tzhxmb22iwu.o b/10-adapter_array/target/debug/incremental/adapter_array-3bef38bs2b5lg/s-fv8zbji8w1-1jok6d6-1rdkh5b02u9qg/10ey4tzhxmb22iwu.o
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+checksum = "f7fe0bb3479651439c9112f72b6c505038574c9fbb575ed1bf3b797fa39dd564"
diff --git a/11-seating_system/Cargo.toml b/11-seating_system/Cargo.toml
index 5ed8346..b04da03 100644
--- a/11-seating_system/Cargo.toml
+++ b/11-seating_system/Cargo.toml
@@ -7,3 +7,6 @@ edition = "2018"
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]
+anyhow = "1.0.37"
+itertools = "0.10.0"
+thiserror = "1.0.23"
diff --git a/11-seating_system/data/input.txt b/11-seating_system/data/input.txt
new file mode 100644
index 0000000..e2c74dc
--- /dev/null
+++ b/11-seating_system/data/input.txt
@@ -0,0 +1,98 @@
+LLLLLLLL.LLLLLLLLL.LL.LLLLLLL.LLLLL.LLLLLLLL.LLLLL.LLLL.LLLLL.LLLLLLLLLLLLLLLLLLLLLLL.LLLLLLLLLL
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+LLLLLLLL.LLLLLLLLL.LLLL.LLLLL..LLLL.LLLLLLLL.LLLLLL.LLLLLLLLL.LL.LLLL.LLLLLLLL.LLLLLL.LLLLLLLLLL
+...L.L.L..LL.......L.LL.L..LL........LLLL.....LL.LLL.L.LL...L.L.......LL....L..L..LL.L....L..LLL
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+LLLL.LLL.LLLLLLLLL.LL...LLL.L.LLLLLLLLLLLLLL.LLLLLL.LLLLLLLLLLLLLLLLL.LLLLLLLL.LLLLLL.LLLLLLLLLL
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+...L......L....L...LLLL.LLLLL.L..LL.L........LL...L.L.LLLLLLLLLL.LL.LLLL...L....L.....L....LL...
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+L.LLLLLL.LLLLLLLLL.LLL..LLLLL.LLLLL.LLLLLLLLLLLLLLL.LLLLLLLLL.LLLLLLLLLLLLLLLL.LLLLLLLLLLLLLLLLL
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+.L.L..L....L...........L.LL....L.......L..L.LL..L.L........L..L.............L.L....LL.LLL..L.LL.
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+LLLLLLLLLLLLLLLLLL.LLLL.LL.LLL..LLLLLLLLLLLL.LLLLLLLLLL.LLLLL.LLLLLLL.LLLLLLLL..LL.LL.LLL.LL.LLL
+........L...L....LL.....LL..L.....LL.LLLL.LL.LLL.....LLL.....LL.L..LLL.....LL.............L....L
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+.L.....L...L.......L...L....L....L..L..LLL.....L............L..LL.L...L.L.L..LL...LLL..L.L.L....
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+.L...LLL.....L.....LLL....LLLL.L.LL....L...L...L.L.L....L.LLLL...L.L....L.....LL.L.....L..L.L...
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+LLLLLLLL.LLLLLLLLL..LLLLL.LL..LLLLLLLLLLL.LLLLLLLLLLL.LLLLLLLLL.LLLLL.LLLLLLLLLLLLLLLLLLLLLLLLLL
+LLLLLLLLLLLLLLLLLL..LLL.LLLLL.LLLLL.LLLLLLLL.LLLLLL..L.LLLLLLLLLLLLLL.LLLLLLLL.LLLLLLLLLLLLLLLLL
+LLLLLLLLLLLLLLLLLLLLLL.LLLLLL.LLLLL.LLLLLLLL.LLLLLL.LLLLL.LLL.LLLLLLL.LLLLL.LL.LLLL.L.LLLLLLLLLL
+LLL.LLLL.LL.LLLLLLLLLLL.LLLLLLLLLL..LLLLLLLL.LL.LLLLL.LL.LLLLLLLLLLLLLLLLLLLLLLLLLLL..LLLLLLLLLL
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diff --git a/11-seating_system/src/main.rs b/11-seating_system/src/main.rs
index e7a11a9..fb90c31 100644
--- a/11-seating_system/src/main.rs
+++ b/11-seating_system/src/main.rs
@@ -1,3 +1,377 @@
-fn main() {
-    println!("Hello, world!");
+use std::{fmt, iter::FromIterator, mem, vec};
+use anyhow::{anyhow, Result};
+use fmt::{Display};
+use itertools::Itertools;
+
+#[derive(Clone, Copy, PartialEq)]
+enum TileType {
+    Floor,
+    Empty,
+    Occupied,
 }
+
+impl Default for TileType {
+    fn default() -> Self {
+        Self::Floor
+    }
+}
+
+impl Display for TileType {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        write!(f, "{}", match self {
+            TileType::Floor => '.',
+            TileType::Empty => 'L',
+            TileType::Occupied => '#',
+        })
+    }
+}
+
+impl fmt::Debug for TileType {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        write!(f, "{}", match self {
+            TileType::Floor => ".",
+            TileType::Empty => "L",
+            TileType::Occupied => "#",
+        })
+    }
+}
+
+impl TileType {
+    fn change<T>(&self, i: T) -> TileType where
+        T: IntoIterator<Item = TileType> {
+            match self {
+                TileType::Empty => {
+                    if i.into_iter()
+                        .filter(|&x| x == TileType::Occupied)
+                        .count() == 0 {
+                            TileType::Occupied
+                        } else {
+                            *self
+                        }
+                }
+                TileType::Occupied => {
+                    if i.into_iter()
+                        .filter(|&x| x == TileType::Occupied)
+                        .count() >= 4 {
+                            TileType::Empty
+                        } else {
+                            *self
+                        }
+                }
+                _ => {
+                    *self
+                } 
+            }
+        }
+
+    fn change_step2<T>(&self, i: T) -> TileType where
+        T: IntoIterator<Item = TileType> {
+            match self {
+                TileType::Empty => {
+                    if i.into_iter()
+                        .filter(|&x| x == TileType::Occupied)
+                        .count() == 0 {
+                            TileType::Occupied
+                        } else {
+                            *self
+                        }
+                }
+                TileType::Occupied => {
+                    if i.into_iter()
+                        .filter(|&x| x == TileType::Occupied)
+                        .count() >= 5 {
+                            TileType::Empty
+                        } else {
+                            *self
+                        }
+                }
+                _ => {
+                    *self
+                } 
+            }
+        }}
+
+impl From<char> for TileType {
+    fn from(c: char) -> Self {
+        match c {
+            '.' => TileType::Floor,
+            'L' => TileType::Empty,
+            '#' => TileType::Occupied,
+            _ => unreachable!()
+        }
+    }
+}
+
+#[derive(Debug, Clone, Copy, PartialEq)]
+struct Vec2 {
+    x: i64,
+    y: i64,
+}
+
+impl<T> From<(T, T)> for Vec2
+    where T: Into<i64> {
+    fn from((x, y): (T, T)) -> Self {
+        Self {
+            x: x.into(),
+            y: y.into()
+        }
+    }
+}
+
+impl<T> From<Vec2> for (T, T)
+    where T: From<i64> {
+    fn from(v: Vec2) -> Self {
+        (v.x.into(), v.y.into())
+    }
+}
+
+impl FromIterator<Vec2> for Vec<(i64, i64)> {
+    fn from_iter<T: IntoIterator<Item = Vec2>>(iter: T) -> Self {
+        iter
+            .into_iter()
+            .map(|v| (v.x, v.y))
+            .collect()
+    }
+}
+
+#[derive(Debug, Clone, PartialEq)]
+struct Map {
+    size: Vec2,
+    tiles: Vec<TileType>,
+}
+
+impl Display for Map {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        for i in 0..self.size.x {
+            for j in 0..self.size.y {
+                write!(f, "{}", self.get((i,j).into()).unwrap())?;
+            }
+            writeln!(f)?
+        };
+        Ok(())
+    }
+}
+
+impl Map {
+    fn new(size: Vec2) -> Self {
+        let num_tiles = size.x * size.y;
+        Self {
+            size,
+            tiles: vec![Default::default(); num_tiles as usize] 
+        }
+    }
+
+    fn index(&self, pos: Vec2) -> Option<usize> {
+        match (pos.x, pos.y) {
+            (x, y) if (0..self.size.x).contains(&x) && (0..self.size.y).contains(&y) => Some((pos.x * self.size.y + pos.y) as usize),
+            _ => None,
+        }
+    }
+
+    fn set(&mut self, pos: Vec2, val: TileType) -> Result<()> {
+        if let Some(index) = self.index(pos) {
+            self.tiles[index] = val;
+            Ok(())
+        } else {
+            Err(anyhow!("Invalid pos {:?} in map of size {:?}", pos, self.size))
+        }
+    }
+
+    fn get(&self, pos: Vec2) -> Option<TileType> {
+        Some(self.tiles[self.index(pos)?])
+    }
+
+    fn neighbors(&self, pos: Vec2) -> impl Iterator<Item = Vec2> {
+        (-1..=1)
+            .cartesian_product(-1..=1)
+            .filter(|v| v != &(0, 0))
+            .map(move |(dx,dy)| Vec2{
+                x: pos.x + dx,
+                y: pos.y + dy
+            })
+    }
+
+    fn neighbors_step2(&self, pos: Vec2) -> impl Iterator<Item = Vec2> {
+        let mut v: Vec<Vec2> = vec![];
+        (-1..=1)
+            .cartesian_product(-1..=1)
+            .filter(|v| v != &(0, 0))
+            .for_each(|(dx,dy)| {
+                let mut ray = pos.clone();
+                loop {
+                    ray.x += dx;
+                    ray.y += dy;
+                    if let Some(tile) = self.get(ray) {
+                        if tile == TileType::Empty || tile == TileType::Occupied {
+                            v.push(ray);
+                            break;
+                        }
+                    } else {
+                        break;
+                    }
+                }
+            });
+        v.into_iter()
+    }
+
+    fn neighbor_tiles(&self, pos: Vec2) -> impl Iterator<Item = TileType> + '_ {
+        self.neighbors(pos)
+            .filter_map(move |v| self.get(v))
+    }
+
+    fn neighbor_tiles_step2(&self, pos: Vec2)
+        -> impl Iterator<Item = TileType> + '_ {
+        self.neighbors_step2(pos)
+            .filter_map(move |v| self.get(v))
+    }
+
+    fn read(input: &str) -> Result<Self> {
+        // Read map size
+        let size = (
+            input.lines().count() as i64,
+            input.lines().next().ok_or_else(|| anyhow!("No lines in input !"))?.chars().count() as i64
+        );
+        let mut m = Self::new(size.into());
+        input
+            .chars()
+            .filter(|&c| c != '\n')
+            .zip(m.tiles.iter_mut())
+            .for_each(|(x, y)| *y = x.into());
+        Ok(m)
+    }
+
+    fn update_to(&self, new: &mut Map) {
+        for i in 0..self.size.x {
+            for j in 0..self.size.y {
+                let pos = (i,j).into();
+                new.set(
+                    pos,
+                    self.get(pos)
+                        .unwrap()
+                        .change(
+                            self.neighbor_tiles(pos)
+                        )
+                    ).unwrap();
+            }
+        }
+    }
+    
+    fn update_to_step2(&self, new: &mut Map) {
+        for i in 0..self.size.x {
+            for j in 0..self.size.y {
+                let pos = (i,j).into();
+                new.set(
+                    pos,
+                    self.get(pos)
+                        .unwrap()
+                        .change_step2(
+                            self.neighbor_tiles_step2(pos)
+                        )
+                    ).unwrap();
+            }
+        }
+    }
+}
+
+fn step1(input: &str) -> usize {
+    let mut m = Map::read(input).unwrap();
+    let mut n = m.clone();
+    let mut i = 0;
+    loop {
+        i += 1;
+        println!("Stage {}", i);
+        mem::swap(&mut m,&mut n);
+        m.update_to(&mut n);
+        // println!("{}", &m);
+        // println!("{}", &n);
+        // Naive, as update_to could also report nb of changes
+        if n == m {
+            break;
+         }
+    };
+    m.tiles.into_iter().filter(|&c| c == TileType::Occupied).count()
+
+}
+
+fn step2(input: &str) -> usize {
+    let mut m = Map::read(input).unwrap();
+    let mut n = m.clone();
+    let mut i = 0;
+    loop {
+        i += 1;
+        println!("Stage {}", i);
+        mem::swap(&mut m,&mut n);
+        m.update_to_step2(&mut n);
+        // println!("{}", &m);
+        // println!("{}", &n);
+        // Naive, as update_to could also report nb of changes
+        if n == m {
+            break;
+         }
+    };
+    m.tiles.into_iter().filter(|&c| c == TileType::Occupied).count()
+
+}
+fn main() {
+    let input = include_str!("../data/input.txt");
+    dbg!(step1(input));
+    dbg!(step2(input));
+    }
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_phase1() {
+        let input = r"L.LL.LL.LL
+LLLLLLL.LL
+L.L.L..L..
+LLLL.LL.LL
+L.LL.LL.LL
+L.LLLLL.LL
+..L.L.....
+LLLLLLLLLL
+L.LLLLLL.L
+L.LLLLL.LL";
+        assert_eq!(step1(input), 37)
+    }
+
+    #[test]
+    fn test_read() {
+        let input = r"L.LL.LL.LL
+LLLLLLL.LL
+L.L.L..L..
+LLLL.LL.LL
+L.LL.LL.LL
+L.LLLLL.LL
+..L.L.....
+LLLLLLLLLL
+L.LLLLLL.L
+L.LLLLL.LL
+";
+        let m = Map::read(input).unwrap();
+        assert_eq!(m.index((0,1).into()).unwrap(), 1);
+        assert_eq!(m.get((0,1).into()).unwrap(), TileType::Floor);
+        assert_eq!(format!("{}",m), input);
+    }
+
+    #[test]
+    fn test_neighbors() {
+        let m = Map::new(Vec2 { x: 5, y: 5 });
+        let n = m.neighbors((1,1).into());
+        assert_eq!(
+            n.collect::<Vec<(_,_)>>(),
+            vec![
+                (0,0),
+                (0,1),
+                (0,2),
+                (1,0),
+                (1,2),
+                (2,0),
+                (2,1),
+                (2,2),
+            ]
+        );
+    }
+}
\ No newline at end of file
diff --git a/12-rain_risk/Cargo.lock b/12-rain_risk/Cargo.lock
new file mode 100644
index 0000000..dbf3b36
--- /dev/null
+++ b/12-rain_risk/Cargo.lock
@@ -0,0 +1,70 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+[[package]]
+name = "anyhow"
+version = "1.0.38"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "afddf7f520a80dbf76e6f50a35bca42a2331ef227a28b3b6dc5c2e2338d114b1"
+
+[[package]]
+name = "proc-macro2"
+version = "1.0.24"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1e0704ee1a7e00d7bb417d0770ea303c1bccbabf0ef1667dae92b5967f5f8a71"
+dependencies = [
+ "unicode-xid",
+]
+
+[[package]]
+name = "quote"
+version = "1.0.8"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "991431c3519a3f36861882da93630ce66b52918dcf1b8e2fd66b397fc96f28df"
+dependencies = [
+ "proc-macro2",
+]
+
+[[package]]
+name = "rain_risk"
+version = "0.1.0"
+dependencies = [
+ "anyhow",
+ "thiserror",
+]
+
+[[package]]
+name = "syn"
+version = "1.0.60"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c700597eca8a5a762beb35753ef6b94df201c81cca676604f547495a0d7f0081"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "unicode-xid",
+]
+
+[[package]]
+name = "thiserror"
+version = "1.0.23"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "76cc616c6abf8c8928e2fdcc0dbfab37175edd8fb49a4641066ad1364fdab146"
+dependencies = [
+ "thiserror-impl",
+]
+
+[[package]]
+name = "thiserror-impl"
+version = "1.0.23"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9be73a2caec27583d0046ef3796c3794f868a5bc813db689eed00c7631275cd1"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
+[[package]]
+name = "unicode-xid"
+version = "0.2.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f7fe0bb3479651439c9112f72b6c505038574c9fbb575ed1bf3b797fa39dd564"
diff --git a/12-rain_risk/Cargo.toml b/12-rain_risk/Cargo.toml
new file mode 100644
index 0000000..eb8401b
--- /dev/null
+++ b/12-rain_risk/Cargo.toml
@@ -0,0 +1,11 @@
+[package]
+name = "rain_risk"
+version = "0.1.0"
+authors = ["Guilhem MARION <gmarion@netc.fr>"]
+edition = "2018"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+anyhow = "1.0.38"
+thiserror = "1.0.23"
diff --git a/12-rain_risk/data/input.txt b/12-rain_risk/data/input.txt
new file mode 100644
index 0000000..4d805f8
--- /dev/null
+++ b/12-rain_risk/data/input.txt
@@ -0,0 +1,776 @@
+R180
+E1
+N1
+R90
+E4
+F84
+W3
+F19
+E5
+N1
+W5
+W4
+R90
+S1
+F70
+R90
+W2
+S3
+L180
+E2
+R90
+E1
+R90
+N2
+E3
+F55
+W3
+R90
+S2
+E4
+L90
+F33
+W4
+S3
+F11
+N4
+W4
+F88
+W3
+F62
+L90
+S3
+W3
+N1
+E3
+E2
+N1
+E3
+S3
+E5
+S4
+W5
+L90
+W5
+R90
+E4
+F36
+N4
+E4
+E5
+F47
+R90
+N3
+E3
+L180
+S5
+R90
+S5
+W2
+S3
+F43
+W2
+R180
+W2
+S2
+L180
+E2
+F49
+L90
+F77
+S5
+E1
+S2
+F39
+L180
+F12
+W1
+L90
+F60
+S2
+E3
+N1
+E5
+R90
+E1
+N4
+W4
+S4
+E2
+L90
+F100
+E3
+F58
+S2
+E4
+F83
+W3
+N1
+R90
+F99
+W5
+W4
+F19
+N3
+W1
+W5
+F70
+R180
+R90
+F58
+E5
+N3
+R90
+N4
+F86
+N4
+F70
+L90
+F36
+R90
+S4
+R180
+N5
+F81
+W5
+R90
+E5
+L90
+F73
+S5
+E3
+N1
+F27
+E2
+N3
+L180
+W2
+F24
+N2
+L90
+F69
+N2
+E3
+F49
+L90
+S4
+W5
+F18
+R180
+F62
+S2
+F65
+E3
+F100
+N1
+F96
+W1
+F75
+L180
+W2
+S2
+F93
+E5
+S3
+R90
+S2
+F34
+R90
+F83
+S1
+W1
+F58
+L180
+N4
+E1
+R90
+W2
+F93
+S3
+F20
+R90
+N3
+E3
+N3
+L90
+F8
+S3
+F18
+S3
+N2
+F6
+L270
+F70
+W5
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+E2
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+E3
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+N2
+W3
+L90
+E4
+F58
+N5
+F97
+W2
+L90
+W5
+S2
+W1
+S5
+F85
+N1
+E1
+N4
+E4
+L90
+E1
+R90
+S5
+L180
+R270
+N1
+L90
+E4
+N3
+F45
+N2
+F68
+R90
+F36
+N5
+F82
+S5
+E4
+R180
+S2
+L180
+N3
+R270
+W5
+F70
+L90
+W5
+F80
+W4
+N2
+R90
+S3
+W1
+F23
+N1
+W1
+N4
+F70
+S3
+L180
+F57
+R90
+L90
+F55
+L90
+N4
+F87
+L90
+F1
+L270
+F17
+N5
+R180
+F84
+R90
+W5
+F7
+W1
+S1
+E3
+F46
+S5
+E2
+F23
+R90
+E4
+W2
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+E5
+L90
+F65
+F3
+S5
+E5
+N3
+W4
+L90
+S2
+F57
+E1
+R90
+F68
+E3
+L90
+W1
+F29
+N5
+W5
+N1
+F95
+N1
+L90
+F31
+S5
+L180
+N2
+W5
+R90
+F27
+E1
+R90
+E3
+S5
+F10
+R90
+N4
+E2
+F25
+S4
+E5
+F51
+N3
+W2
+L90
+S3
+L180
+F17
+E4
+F93
+E3
+L90
+F41
+L90
+S5
+L90
+W5
+N1
+F81
+L90
+E4
+W2
+R90
+W1
+S5
+R90
+F39
+W3
+R90
+N5
+E1
+L90
+F82
+S3
+R90
+W4
+F66
+F4
+L90
+F77
+R90
+E1
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+F53
+S4
+F35
+W1
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+R90
+F9
+S1
+E1
+L90
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+R90
+S2
+W5
+R90
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+L90
+N3
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+N5
+E5
+N4
+F35
+N5
+W1
+N1
+E5
+F15
+R180
+F92
+W3
+L90
+F4
+L90
+E1
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+W3
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+S3
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+E2
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+F6
+N2
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+E2
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+S1
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+S1
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+S3
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+W4
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+W5
+L90
+N1
+E1
+S2
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+S2
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+S3
+N3
+W1
+N4
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+L90
+E3
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+N1
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+N2
+W4
+N3
+F53
+E5
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+W2
+F60
+L90
+E2
+F19
+S1
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+W5
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+F83
+N4
+W5
+F37
+S1
+F50
+E1
+N2
+W3
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+S4
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+N4
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+W4
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+R90
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+L90
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+N3
+N3
+E1
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+W5
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+L90
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+W4
+S2
+W3
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+F72
+W5
+F78
+N2
+F65
+S3
+F47
+S5
+R90
+F68
+L180
+W2
+F7
+E2
+E3
+S4
+R90
+N2
+L180
+W2
+R180
+E4
+R90
+W3
+L90
+E4
+F54
+L180
+E2
+F6
+W5
+F82
+E4
+R90
+E4
+F25
+N2
+R270
+N4
+F18
+N5
+R90
+S3
+R90
+F38
+R90
+F97
+W4
+F85
+S4
+F56
+E4
+S1
+F40
+W3
+F52
+L90
+F76
+N4
+F15
+S2
+F22
+S5
+L180
+F91
+L180
+F8
+L90
+E4
+N4
+F67
+L90
+S3
+R180
+R90
+N4
+F71
+W3
+F34
+E2
+N1
+F43
+W5
+L180
+N5
+W2
+F42
+R90
+W3
+F39
+E1
+S2
+L180
+N5
+E3
+N5
+F28
+E1
+R90
+S3
+F40
+L90
+S2
+S2
+L90
+W5
+L90
+F93
+R180
+W4
+S4
+W4
+F100
+S3
+R90
+E2
+L180
+W1
+E3
+S5
+L90
+F87
+N1
+R90
+F3
+R90
+E5
+R90
+S3
+F45
+L90
+S2
+F42
+R90
+F95
+L90
+E1
+N3
+R90
+F73
+S3
+E1
+L90
+S2
+E3
+L90
+L270
+F38
+S5
+R90
+F42
+L90
+N1
+F7
+S3
+F65
+N2
+F42
+L180
+W5
+S4
+E4
+F65
+S4
+E5
+F51
+E4
+R180
+F70
+R90
+F28
+N5
+W5
+N1
+F96
+L90
+W4
+S3
+W3
+F89
+W1
+L90
+F75
+L270
+S3
+R90
+L90
+F7
+E2
+F24
+R180
+S2
+L180
+F48
+R90
+F37
+W2
+R90
+W4
+L90
+W3
+F81
+E4
+N2
+F39
+E4
+N1
+W1
+L90
+F59
diff --git a/12-rain_risk/src/bin/day12.rs b/12-rain_risk/src/bin/day12.rs
new file mode 100644
index 0000000..c400075
--- /dev/null
+++ b/12-rain_risk/src/bin/day12.rs
@@ -0,0 +1,7 @@
+use rain_risk::{step1, step2};
+
+fn main() {
+    let input = include_str!("../../data/input.txt");
+    println!("Step 1 : {}", step1(input));
+    println!("Step 2 : {}", step2(input));
+}
\ No newline at end of file
diff --git a/12-rain_risk/src/lib.rs b/12-rain_risk/src/lib.rs
new file mode 100644
index 0000000..b1e5227
--- /dev/null
+++ b/12-rain_risk/src/lib.rs
@@ -0,0 +1,152 @@
+
+
+use program::{Direction, Instruction, parse_program};
+
+pub mod program;
+
+struct Ship {
+    position: (i64, i64),
+    direction: program::Direction,
+    wpt: (i64, i64),
+}
+
+impl Default for Ship {
+    fn default() -> Self {
+        Self {
+            position: (0, 0),
+            direction: Direction::East,
+            wpt: (10, 1),
+        }
+    }
+}
+
+impl Ship {
+    fn execute(&mut self, i: &Instruction) {
+        // eprintln!("Executing {}: previously at {:?}", i, self.position);
+        match i {
+            Instruction::Direction(d, e) => {
+                match d {
+                    Direction::North => {
+                        self.position.1 += e;
+                    }
+                    Direction::South => {
+                        self.position.1 -= e;
+                    }
+                    Direction::East => {
+                        self.position.0 += e;
+                    }
+                    Direction::West => {
+                        self.position.0 -= e;
+                    }
+                }
+            }
+            Instruction::Rotation(r, e) => {
+                for _ in 0..e/90 {
+                    self.direction = match r {
+                        program::Rotation::Left => {
+                            match self.direction {
+                                Direction::North => {Direction::West}
+                                Direction::East => {Direction::North}
+                                Direction::South => {Direction::East}
+                                Direction::West => {Direction::South}
+                            }
+                        }
+                        program::Rotation::Right => {
+                            match self.direction {
+                                Direction::North => {Direction::East}
+                                Direction::East => {Direction::South}
+                                Direction::South => {Direction::West}
+                                Direction::West => {Direction::North}
+                            }
+                        }
+                    }
+                }
+            }
+            Instruction::Forward(e) => {
+                match self.direction {
+                    Direction::North => {
+                        self.position.1 += e;
+                    }
+                    Direction::East => {
+                        self.position.0 += e;
+                    }
+                    Direction::South => {
+                        self.position.1 -= e;
+                    }
+                    Direction::West => {
+                        self.position.0 -= e;
+                    }
+                }
+            }
+        }
+        // eprintln!("Now at {:?}", self.position);
+    }
+
+    // Execute for step2
+    fn execute2(&mut self, i: &Instruction) {
+        // eprintln!("Executing {}: previously at {:?}", i, self.position);
+        match i {
+            Instruction::Direction(d, e) => {
+                match d {
+                    Direction::North => {
+                        self.wpt.1 += e;
+                    }
+                    Direction::South => {
+                        self.wpt.1 -= e;
+                    }
+                    Direction::East => {
+                        self.wpt.0 += e;
+                    }
+                    Direction::West => {
+                        self.wpt.0 -= e;
+                    }
+                }
+            }
+            Instruction::Rotation(r, e) => {
+                for _ in 0..e/90 {
+                    // Don't count on me to XOR everything to avoid
+                    // copies, cheers !
+                    let wpt = self.wpt;
+                    match r {
+                        program::Rotation::Left => {
+                            self.wpt.0 = -wpt.1;
+                            self.wpt.1 = wpt.0;
+                        }
+                        program::Rotation::Right => {
+                            self.wpt.0 = wpt.1;
+                            self.wpt.1 = -wpt.0;
+                        }
+                    }    
+                }
+            }
+            Instruction::Forward(e) => {
+                self.position.0 += e * self.wpt.0;
+                self.position.1 += e * self.wpt.1;
+            }
+        }
+        // eprintln!("Now at {:?}", self.position);
+    }
+    pub fn manhattan(&self) -> u64 {
+        (self.position.0.abs() + self.position.1.abs()) as u64
+    }
+}
+
+pub fn step1(input: &str) -> u64 {
+    // Parse input into path
+    let p = parse_program(input).unwrap();
+    // Setup ship
+    let mut s = Ship::default();
+    // Execute ops
+    p.iter().for_each(|i| s.execute(i));
+    s.manhattan()
+}
+
+pub fn step2(input: &str) -> u64 {
+    // Parse input into path
+    let p = parse_program(input).unwrap();
+    // Setup ship
+    let mut s = Ship::default();
+    // Execute ops
+    p.iter().for_each(|i| s.execute2(i));
+    s.manhattan()
+}
\ No newline at end of file
diff --git a/12-rain_risk/src/program.rs b/12-rain_risk/src/program.rs
new file mode 100644
index 0000000..6e38028
--- /dev/null
+++ b/12-rain_risk/src/program.rs
@@ -0,0 +1,124 @@
+use std::{fmt::{Display}, str::FromStr};
+
+use anyhow::Error;
+
+#[derive(Debug, PartialEq)]
+pub enum Direction {
+    North,
+    East,
+    South,
+    West,
+}
+
+impl Display for Direction {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        write!(f, "{}", match self {
+            Direction::North => {'N'}
+            Direction::South => {'S'}
+            Direction::East => {'E'}
+            Direction::West => {'W'}
+        })
+    }
+}
+
+#[derive(Debug, PartialEq)]
+pub enum Rotation {
+    Left,
+    Right,
+}
+
+impl Display for Rotation {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        write!(f, "{}", match self {
+            Rotation::Left => {'L'}
+            Rotation::Right => {'R'}
+        })
+    }
+}
+
+#[derive(PartialEq)]
+pub enum Instruction {
+    Direction(Direction, i64),
+    Rotation(Rotation, i64),
+    Forward(i64),
+}
+
+impl FromStr for Instruction {
+    type Err = anyhow::Error;
+
+    fn from_str(s: &str) -> Result<Self, Self::Err> {
+        let mut sc = s.chars();
+        match sc.next().ok_or_else(|| anyhow::anyhow!("Expected NSEWLRF"))? {
+            d @ 'N' | d @ 'S' | d @ 'E' | d @ 'W' => {
+                Ok(Instruction::Direction(
+                    match d {
+                        'N' => Direction::North,
+                        'S' => Direction::South,
+                        'E' => Direction::East,
+                        'W' => Direction::West,
+                        _ => unreachable!() // Somehow needed ??
+                    },
+                    sc.collect::<String>().parse::<i64>()?)
+                )
+            },
+            r @ 'L' | r @ 'R' => {
+                Ok(Instruction::Rotation(
+                    match r {
+                        'L' => Rotation::Left,
+                        'R' => Rotation::Right,
+                        _ => unreachable!() // Somehow needed ?
+                    },
+                    sc.collect::<String>().parse::<i64>()?))
+            },
+            'F' => {
+                Ok(Instruction::Forward(sc.collect::<String>().parse::<i64>()?))
+            },
+            e  => Err(anyhow::anyhow!("Expected NSEWLRF, got {}", e)), 
+        }
+    }
+}
+
+impl Display for Instruction {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        match self {
+            Instruction::Direction(d, e) => {
+                write!(f, "{}{}", d, e)
+            },
+            Instruction::Rotation(r, e) => {
+                write!(f, "{}{}", r, e)
+            },
+            Instruction::Forward(e) => {write!(f, "F{}", e)},
+        }
+    }
+}
+
+pub type Program = Vec<Instruction>;
+
+pub fn parse_program(input: &str) -> Result<Program, Error> {
+    Ok(input.lines()
+        .map(|l| l.parse::<Instruction>())
+        .collect::<Result<_,_>>()?)
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_readwrite() {
+        let input = r"F10
+N3
+F7
+R90
+F11";
+        assert_eq!(
+            input
+                .lines()
+                .map(|l| l.parse::<Instruction>().unwrap())
+                .map(|i| i.to_string())
+                .collect::<Vec<String>>()
+                .join("\n"),
+            input
+        )
+    }
+}
\ No newline at end of file
diff --git a/12-rain_risk/tests/tests.rs b/12-rain_risk/tests/tests.rs
new file mode 100644
index 0000000..9335a76
--- /dev/null
+++ b/12-rain_risk/tests/tests.rs
@@ -0,0 +1,14 @@
+use rain_risk::*;
+
+
+#[test]
+fn test_step1() {
+    let input = "F10\nN3\nF7\nR90\nF11";
+    assert_eq!(step1(input), 25);
+}
+
+#[test]
+fn test_step2() {
+    let input = "F10\nN3\nF7\nR90\nF11";
+    assert_eq!(step2(input), 286);
+}
\ No newline at end of file
diff --git a/13-shuttle_search/Cargo.toml b/13-shuttle_search/Cargo.toml
new file mode 100644
index 0000000..4258a1f
--- /dev/null
+++ b/13-shuttle_search/Cargo.toml
@@ -0,0 +1,9 @@
+[package]
+name = "shuttle_search"
+version = "0.1.0"
+authors = ["Guilhem MARION <gmarion@netc.fr>"]
+edition = "2018"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
diff --git a/13-shuttle_search/src/main.rs b/13-shuttle_search/src/main.rs
new file mode 100644
index 0000000..e7a11a9
--- /dev/null
+++ b/13-shuttle_search/src/main.rs
@@ -0,0 +1,3 @@
+fn main() {
+    println!("Hello, world!");
+}